The map represents the northwest region of the United States. A line extends across the region from east to west moving over the Rocky Mountains towards the coastal region of Oregon. Review the map above. Why is the black line significant in American history?

It represents the northern boundary line for territory claimed by Mexico.
It represents the main route for settlers moving into the Oregon Territory.
It represents the northern boundary line for the territory claimed by the United States.
It represents the path of the Transcontinental Railroad, a major trade route in the United States.

Is B

Explanation:

i dont know how

native americans

american indians have appeared on many u.s. coins including the buffalo nickel

benjamin franklin learned a lot about democracy by observing the iroquois indian

the term "indian" originated with christopher columbus. he thought that he had reached the east indies when he landed in america and therefore named the inhabitants indians.

camping

camping can relieve stress and depression

your campfire may be a hazard

long-term campsites include permanent and semi-permanent setups and can lead to closer relationships with neighboring campers

buffalo

buffalo are herbivores and feed on about 60 pounds of plant material and grasses a day.

buffalo are considered to be an adult when they reach 3 years old.

buffalo’s tail can be almost three feet long, and they use it to swap at pesky bugs.

the award is named for an american naval historian and theorist, rear admiral alfred thayer mahan, united states navy who, through his writing, provided stimulus and guidance to those who share in the defense of the nation.